(usagi-users 03754) Re: why this caution?

On Mon, Oct 02, 2006 at 02:41:05PM -0700, jackc wrote :
> use of scoped address can be troublesome  <-------------------why is 
> this so?
> ---> EPRT |2|fe80::260:69ff:fe90:529d%eth0|3347|
> 500 Bad EPRT command.
> ---> LPRT 6,16,254,128,0,0,0,0,0,0,2,96,105,255,254,144,82,157,2,13,19
> 500 Unknown command.
> ftp: bind: Address already in use

> my question is, being new to ipv6, why is this messaged here?
> what is it trying to tell me?

As you can see, it does not work properly, which is why you are being
warned. I think this matter was already discussed just a few days ago;
link-local addresses are not well defined with FTP. There is no defined
way to specify the scope, for there is no way for the client to know the
scope as seen from the server.

Sending just "EPTR |||3347|" might work with some carefully designed
FTP servers.

-- 
Rémi Denis-Courmont
http://www.remlab.net/